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DannoXYZ · January 6th, 2022, 09:58 AM

yup, too much petrol from rich mixtures still burning when exhaust valves open.

Also seen it when sparks aren't strong or with too little advance. Mixtures haven't fully combusted by time exhaust valves open and continue to burn in pipes.

Might even be case of fried exhaust valves since clearance were so tight?

Do compression test.

January 6th, 2022, 09:58 AM	#142
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	yup, too much petrol from rich mixtures still burning when exhaust valves open. Also seen it when sparks aren't strong or with too little advance. Mixtures haven't fully combusted by time exhaust valves open and continue to burn in pipes. Might even be case of fried exhaust valves since clearance were so tight? Do compression test.
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